Chromatic-stable white organic light-emitting devices incorporating red color conversion layers

Chromatic-stable white organic light-emitting devices (WOLEDs) are reported by combining simple blue fluorescent devices based on a new kind of blue emitter TC-1759 (derivation of N6,N6,N12,N12-tetrap-tolylchrysene-6,12-diamine) with red color conversion layer (DCJTB). By adjusting the thickness of color conversion layers (CCLs), a very pure white light emission with CIE coordinates of (0.34, 0.33) is obtained at the fixed bias of 8 V, and its color temperature is 5036 K. The chromaticity of the device shows a good stability with a slight offset of (0.03, 0.02) at the driving voltage varied from 6 V to 10 V. The maximum luminance and maximum current efficiency achieved 1348 cd/m2 (12 V), and 1.37 cd/A at 3.52 mA/cm2.

► A novel WOLED was fabricated by combining a blue device with color conversion film. ► A pure white emission could be achieved from the devices with simplified structure. ► The white light emission of the devices shows an outstanding chromatic-stability.